ssti-testing

ssti-testing is a skill for Claude Code, Codex from NeoTheCapt/RedteamAgent. It costs 16 tokens per session (911 once invoked), scanned A, original, no licence file.

A guide for testing server-side template injection, a flaw where user input is treated as template code by a website server, including identifying the template system and checking for code execution.

In plain words
What is it for?
Use it to detect this vulnerability, identify the template engine involved, and assess whether it could lead to remote code execution.
Why use it?
It helps determine whether submitted text can control server-side page generation or run unintended commands.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/neothecapt/redteamagent/ssti-testing
Any agent
npx skills add NeoTheCapt/RedteamAgent --skill ssti-testing
Clone the repo
git clone --depth 1 https://github.com/NeoTheCapt/RedteamAgent

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for ssti-testing

README.md
[![agentmods](https://agentmods.dev/badge/skills/neothecapt/redteamagent/ssti-testing.svg)](https://agentmods.dev/skills/neothecapt/redteamagent/ssti-testing)
Your own site
<a href="https://agentmods.dev/skills/neothecapt/redteamagent/ssti-testing"><img src="https://agentmods.dev/badge/skills/neothecapt/redteamagent/ssti-testing.svg" alt="Measured on agentmods" height="20"></a>
Per session 16 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 911 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 2 findings. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00016 $0.00911
Opus 5 $0.00008 $0.00456
Sonnet 5 $0.00003 $0.00182
Haiku 4.5 $0.00002 $0.00091

Measured 3d ago against content hash 832aff10adeb, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

ssti-testing scanned grade A with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- run_tool curl / Burp Suite Repeater

Runs shell commandslowCapability

Expected in a hook, worth knowing in a rule or an instructions file.

- [ ] Jinja2: walk MRO to find `subprocess.Popen` or `os.popen`
agent/skills/ssti-testing/SKILL.md · 102 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 3d ago First seen · 102 lines · 16 tokens per session scan A 832aff10adeb

Subscribe to this mod's changes

ssti-testing is a skill published in the GitHub repository NeoTheCapt/RedteamAgent (122 stars, last pushed 1mo ago), with no licence file. It adds 16 tokens to every session and 911 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 2 findings (makes network calls, runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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